I'm sure you mean 'at the least,' but the most is 50, because we have 50 states. (not including Washington D.C, which also gets to vote.)
Republican Party candidate John Fremont won 11 northern states in the 1856 presidential election.
Republican Party candidate John Fremont won 11 northern states in the 1856 presidential election .
Democratic Party candidate Harry Truman won the 1948 presidential election defeating Republican Party candidate Thomas Dewey.
None.
60-60
The United States presidential election of 2016 will be the 58th quadrennial U.S. presidential election and is scheduled for Tuesday, November 8, 2016.
Mitt Romney was not a candidate in the U. S. Presidential Election of 2008.
Paul "Bear" Bryant was not a candidate in the 1968 presidential election. He was a highly successful college football coach, not a politician.
20
282 states switched parties (to Democrats) in the 1932 presidential election with only 374 remaining loyal to the Republican candidate.
A Presidential candidate must obtain 270 Electoral Votes (the vote cast in the electoral college of the U.S. by the representatives of each state in a presidential election) to be elected President of the United States.
Republican Party candidate Abraham Lincoln was not on the ballot in Mississippi in the 1860 presidential election.